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Finding the Fourth Proportional to 811.83, 1,120.19 and 516.72

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Solution

The fourth proportional to 811.83, 1,120.19 and 516.72 is: 712.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.83 : 1,120.19 = 516.72 : x
  2. Step 2: Convert to fraction form
    811.83/1,120.19 = 516.72/x
  3. Step 3: Cross multiply
    811.83x = 1,120.19 × 516.72
  4. Step 4: Simplify right side
    811.83x = 578,821.99
  5. Step 5: Solve for x
    x = 578,821.99/811.83
  6. Step 6: Final answer
    x = 712.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.